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Novel Immune Response Evasion Strategy to Redose Adeno-Associated Viral Vectors and Prolong Survival in Surfactant Protein-B Deficient Mice

ABSTRACT: The goals and objectives for this study are to determine whether AAV containing TLR9 inhibitory oligonucleotide sequences (AAV-hSPBTLR9i) can mitigate the immune response sufficiently to redose AAV in the lungs and prolong the survival of SP-B deficient mice.

ORGANISM(S): Mus musculus

PROVIDER: GSE282558 | GEO | 2024/11/26

REPOSITORIES: GEO

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			Action	DRS
		Other
	GSE282558_ALL_normalized_data_Samples1_to_24.csv.gz	Csv
	GSE282558_ALL_normalized_data_Samples25_to_33.csv.gz	Csv
	GSE282558_RAW.tar	Raw
	filelist.txt	Txt

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Project description:Adeno-associated virus (AAV) vectors have been used successfully in clinical trials for patients with hemophilia or blindness, but pre-existing neutralizing antibodies (Nab) are common in the general population and exclude many patients from clinical trials. Exploration of effective strategies to enhance AAV transduction and escape from Nab activity is still imperative. Previous studies have shown the compatibility of capsids from AAV serotypes and homology of recognition sites of AAV Nab located on different capsid subunits from one virion. In this study, we co-transfected AAV2 and AAV8 helper plasmids at different ratios (3:1, 1:1 and 1:3) to assemble haploid capsids and study both their transduction efficiency and Nab escape activity. After muscular injection, all of the haploid viruses induced higher transduction than their parental AAV vectors (2- to 9-fold over AAV2), with the highest of these being the haploid vector AAV2/8 3:1. After systemic administration, a 4-fold higher transduction in the liver was observed with haploid AAV2/8 1:3 than that with AAV8 alone. We then packaged the therapeutic factor IX cassette into haploid AAV2/8 1:3 capsids and injected them into FIX knockout mice via the tail vein. Higher FIX expression and improved phenotypic correction were achieved with the haploid AAV2/8 1:3 virus vector when compared to that of AAV8. Additionally, the haploid virus AAV2/8 1:3 was able to escape AAV2 neutralization and did not increase capsid antigen presentation capacity when compared to AAV8. To improve the Nab evasion ability of the haploid virus, we produced the triploid vector AAV2/8/9 by co-transfecting AAV2, AAV8 and AAV9 helper plasmids at a ratio of 1:1:1. After systemic administration, a 2-fold higher transduction in the liver was observed with the triploid vector AAV2/8/9 than that with AAV8. Nab analysis demonstrated that the triploid AAV2/8/9 vector was able to escape Nab activity from mouse sera immunized with parental serotypes. These results indicate that polyploid viruses might potentially acquire advantages from parental serotypes for enhancement of AAV transduction and evasion of Nab recognition without increasing capsid antigen presentation in target cells. Polyploid AAV vectors can be generated from any AAV serotype, whether natural, rational, library derived or a combination thereof, providing a novel strategy that should be explored in future clinical trials in patients with neutralizing antibodies.

Dataset Information

Novel Immune Response Evasion Strategy to Redose Adeno-Associated Viral Vectors and Prolong Survival in Surfactant Protein-B Deficient Mice

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